Combined ruler, calculator and clock



FIG. 1 is a top and left front perspective view of a combined ruler, calculator and clock showing my new design;

FIG. 2 is a bottom and right rear perspective view thereof;

FIG. 3 is a top-right perspective view thereof with the clock/calculator in a removed and inverted position. 

The ornamental design for a combined ruler, calculator and clock, as shown and described. 